编写Qt的QStackWidget示例用法代码

QStackedWidget是一个用于管理多个窗口的小部件，它可以让用户在这些窗口之间进行切换。以下是一个简单的示例代码：

#include <QtWidgets>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QStackedWidget stackedWidget;

    QWidget *page1 = new QWidget;
    QLabel *label1 = new QLabel("This is page 1");
    QVBoxLayout *layout1 = new QVBoxLayout(page1);
    layout1->addWidget(label1);

    QWidget *page2 = new QWidget;
    QLabel *label2 = new QLabel("This is page 2");
    QVBoxLayout *layout2 = new QVBoxLayout(page2);
    layout2->addWidget(label2);

    stackedWidget.addWidget(page1);
    stackedWidget.addWidget(page2);

    QPushButton *button1 = new QPushButton("Show page 1");
    QObject::connect(button1, &QPushButton::clicked, [&](){
        stackedWidget.setCurrentWidget(page1);
    });

    QPushButton *button2 = new QPushButton("Show page 2");
    QObject::connect(button2, &QPushButton::clicked, [&](){
        stackedWidget.setCurrentWidget(page2);
    });

    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(button1);
    layout->addWidget(button2);

    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addWidget(&stackedWidget);
    mainLayout->addLayout(layout);

    QWidget window;
    window.setLayout(mainLayout);
    window.show();

    return app.exec();
}